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GM-M37 16" ,5.56x45mm 1:8 Twist


Product Description

  • Caliber- 5.56x45mm
  • Twist Rate- 1:8
  • Length- 16"
  • Profile- Government Under "See 1 more picture" there is a detailed drawing of this barrel.
  • Finish- Bead Blast Passivization
  • Gas System Length- Mid
  • Gas Block OD- .750+-(.001)
  • Steel Type- 416SS
  • Thread Pitch-1/2x28
  •  Weight- 1.75lbs

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Product Reviews

Showing reviews 1-5 of 20 | Next

  1. Good Value 5 Star Review

    Posted by on 21st Feb 2021

    Built a cheap carbine and found that all barrels were out of stock everywhere. AR STONER at midway was what I bought first. Complete garbage. Then I noticed Green Mountain had some of these in stock.

    Barrel arrived quickly. Profile is medium, not heavy under handguards. Bore looked OK no burrs at the gas port etc. Headspaced with my bolt, was not dimpled for gas block so I did it myself.

    Ejection is right at 2 o'clock in a nice neat pile. Not overgassed.

    Groups 1.5MOA for 10 rounds using mk262. Was shooting off a bipod using a Leupold MR/T scope. Looking at the groups I am pretty sure that it could put 5 into an inch or perhaps better with a flat base varmint bullet.

    For 200 bucks shipped I would buy again.

  2. This is a really nice looking barrel for the money, 5 Star Review

    Posted by on 18th Feb 2021

    This barrel looks very nice, fit and finish are perfect, can't wait to shoot it. Rifling looks really good.

  3. Awesome Option for 556 RECCE Style Build 5 Star Review

    Posted by on 16th Dec 2020

    I have owned and shot many barrels in my ARs over the years, and this is one of the absolute best in terms of cost and accuracy. Shooting sub-MOA groups consistently with most rounds touching on paper at 50 and 100 yards. I stretch it out to 200 with 4x magnification on 8" steel plates and rang every shot effortlessly. The finish is also flawless. Although I haven't stretched it further just yet, I am looking forward to running this setup in both my next carbine course and 3G match.

  4. Never give a top score to anything because ... 4 Star Review

    Posted by on 13th Sep 2019

    You don't know about or have the ability to try everything out there. This build is to an individual who has one I built with this barrel, and there are 5 others including one I have, and this barrel was chosen. This barrel shoots to expectations ie 1 MOA or less depending on the load and the individuals capabilities.

  5. Top Quality and Accuracy!! 5 Star Review

    Posted by on 27th May 2019

    These barrels are fantastic! Great price and outstanding accuracy!! I’m an avid 3 gunner and these are the only barrels I buy. I’m getting 1/2 MOA from all the barrels I’ve purchased, so I’m sticking with what works. I shoot a lot, in fact I always bring 2 identical rifles during training so I can switch them during drills and courses of fire; I don’t like getting them too hot. They don’t last forever, so I just order a new one when accuracy degrades.
    Thanks Green Mountain!! :)

Showing reviews 1-5 of 20 | Next